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If the compiler/arch combination does not provide compiler barriers, provide a fallback. That fallback simply consists out of a function call into a externally defined function. That should guarantee compiler barrierer semantics except for compilers that do inter translation unit/global optimization - those better provide an actual compiler barrier. Hopefully this fixes Tom's report of linker failures due to pg_compiler_barrier_impl not being provided. I'm not backpatching this commit as it builds on the new atomics infrastructure. If we decide an equivalent fix needs to be backpatched, I'll do so in a separate commit. Discussion: 27746.1420930690@sss.pgh.pa.us Per report from Tom Lane. |
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